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Control of applied temperature and surface load of Songshan Silca heating elements under diffent atmosphere

Number of visits: Date:8/20/2017 10:17:38

Control of applied temperature and surface load of Songshan Silca heating elements under diffent atmosphere

Atmosphere

Furnace Temp(℃)

Surface Load(W/cm³)

Acting to the element

Solve way

Ammonia

1290

3.8

Acting on SiC to form thus decrease SiO2 protective film   

Active at dew point

CO2

1450

3.1

Attack SiC

Protecting by quartz tube

18%CO

1500

4.0

No action

 

20%CO

1370

3.8

Adsorbing C grains to act on SiO2 protective film   

 

Halogen

704

3.8

Attacking SiC and decreasing SiO2 protective film   

Protecting by quartz tube

Hydrocarbon

1310

3.1

Adsorbing C grains causes hot pollution

Fill with enough air

Hydrogen

1290

3.1

Acting on SiC to form thus decrease  SiO2 protective film    

Active at dew point

Methane

1370

3.1

Adsorbing C grains causes hot pollution

 

N

1370

3.1

Acting with SiC forms SiN insulating layer

 

Na

1310

3.8

Attack SiC

Protecting by quartz tube

SO2

1310

3.8

Attack SiC

Protecting by quartz tube

Vacuum

1204

3.8

 

 

Oxygen

1310

3.8

SiC is oxided

 

Waterdifferent contents

1090~1370

3.1~3.6

Acting on SiC forms hydtate of Silicon

 

The key factor to the optimum service life of the element is to select the surface load of the element correctly according to the furnace construction ,atmosphere and temperature. Below figure shows the relation between furnace temperatures, element temperature and element surface load under the condition that the element radiation isn’t obstructed.

  

Recommend surface load:

Furnace Temp ℃

1100

1200

1300

1350

1400

1450

Surface load of hot zone (W/m2)

<17

<13

<9

<7

<5

<4

TypeInfo: Technical Support

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